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Updated: May 7, 2026

Implementation of In Vitro Drug Resistance Assays: Maximizing the Potential for Uncovering Clinically Relevant Resistance Mechanisms
Published on: December 9, 2015
Pharmacokinetics, clinical indications, and resistance mechanisms in molecular targeted therapies in cancer
Benjamin Izar1, Julia Rotow, Justin Gainor
110 North Grove Street, LRH 214, Boston, MA, 02114. bchabner@partners.org.
Abstract:
The strategy for discovery and development of new cancer drugs has shifted the field from cytotoxic agents to therapies that selectively target oncogenic drivers. In the last decade, a number of targeted cancer therapies have been discovered and proven effective in a variety of hematological and solid malignancies. In this article, we review clinical pharmacokinetic characteristics of the U.S. Food and Drug Administration-approved targeted therapies and provide an overview of key clinical trials that led to approval of these drugs. The major limiting factor of targeted treatment is the development of resistance. We describe general principles of resistance and specific, clinically confirmed mechanisms of resistance to several therapies in different malignancies.
Insights
New cancer drug development focuses on targeted therapies, not just cytotoxic agents. This review covers FDA-approved targeted cancer drugs, their clinical trials, and mechanisms of resistance.
Area of Science:
- Oncology
- Pharmacology
- Drug Development
Background:
- Cancer treatment has evolved from cytotoxic agents to targeted therapies.
- Targeted therapies selectively inhibit oncogenic drivers in various cancers.
- Significant advancements in targeted cancer therapies have emerged in the last decade.
Purpose of the Study:
- To review the clinical pharmacokinetic characteristics of FDA-approved targeted cancer therapies.
- To provide an overview of pivotal clinical trials leading to drug approvals.
- To describe resistance mechanisms against targeted cancer treatments.
Main Methods:
- Literature review of U.S. Food and Drug Administration (FDA) approved targeted therapies.
- Analysis of clinical pharmacokinetic data.
- Summary of key clinical trial outcomes.
- Description of general and specific resistance principles and mechanisms.
Main Results:
- Numerous targeted therapies are now approved for hematological and solid malignancies.
- Pharmacokinetic profiles and clinical trial data support their efficacy.
- Development of resistance is a major challenge in targeted cancer therapy.
- Specific resistance mechanisms have been identified for several targeted agents.
Conclusions:
- Targeted cancer therapies represent a paradigm shift in oncology.
- Understanding pharmacokinetics and resistance is crucial for optimizing treatment.
- Continued research into overcoming resistance is essential for improving patient outcomes.
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